I have a Sony PRS-700, and have 687 books on the 8-gig memory card. Unfortunately, I have 894 books in Calibre. I have tried formatting my card and reloading, deleting all books from my card and reloading, force reloading of some of the books that didn't transfer - all with no results. These are books that have previously downloaded with no problem and contain .lrf, .epub and .pdf books. I have PLENTY of space left on my card.

I have also doublechecked to make sure that the actual books are in my Calibre library. They are.